Which of the Responses Below Are Sources of Weighing Error

Multiple Choice

Which of the responses below are sources of weighing error? I Weighing a sample that is warmer than ambient temperature.
II Cooling a sample in a desiccator prior to weighing.
III Periodically calibrating the balance.
IV The temperature of the balance changing over time.

A) I and II
B) I and III
C) II and IV
D) II and III
E) I and IV